Cookieless Delivery of Personalizied Content

2. The computer-implemented method of claim 1, wherein the user-specific data stored in the local machine application comprises user application history data stored in a privacy sandbox of an application data repository, wherein the user application history data indicates a behavior of the user interacting with the local machine application.

3. The computer-implemented method of claim 1, wherein the user-specific data stored in the local machine application comprises user-specific attribute data.

4. The computer-implemented method of claim 1, wherein the requested and received targeted content contains user-specific personalized content.

5. The computer-implemented method of claim 1, wherein the requested and received targeted content contains user-specific content.

6. The computer-implemented method of claim 1, further comprising replying to a request to provide an updated query model from the local machine application.

7. The computer-implemented method of claim 1, wherein the application-executable library is configured to cause the local machine application to locally process at least one query from the query model against locally stored at least one of user attribute data and historical user application activity.

8. The computer-implemented method of claim 7, wherein the at least one query from the query model is configured to provide instructions to the application-executable library, the instructions configured to collect at least one of the user attribute data and the historical user application activity.

9. The computer-implemented method of claim 1, where the query model comprises a prioritized decision tree graph query model.

10. The computer-implemented method of claim 1, further comprising generating a browser application executable library comprising the query index model, the browser application executable library configured to execute within a local machine browser application of the user.

12. The computer-implemented system of claim 11, wherein the user-specific data stored in the local machine application comprises user application history data stored in a privacy sandbox of an application data repository, wherein the user application history data indicates a behavior of the user interacting with the local machine application.

13. The computer-implemented system of claim 11, wherein the user-specific data stored in the local machine application comprises user-specific attribute data.

14. The computer-implemented system of claim 11, wherein the requested and received targeted content contains user-specific personalized content.

15. The computer-implemented system of claim 11, wherein the requested and received targeted content contains user-specific content.

16. The computer-implemented system of claim 11, further comprising replying to a request to provide an updated query model from the local machine application.

17. The computer-implemented system of claim 11, wherein the application-executable library is configured to cause the local machine application to locally process at least one query from the query model against locally stored at least one of user attribute data and historical user application activity.

18. The computer-implemented system of claim 17, wherein the at least one query from the query model is configured to provide instructions to the application-executable library, the instructions configured to collect at least one of the user attribute data and the historical user application activity.

19. The computer-implemented system of claim 11, where the query model comprises a prioritized decision tree graph query model.

20. The computer-implemented system of claim 11, wherein the application executable script library is configured to be associated with a Uniform Resource Locator (URL).

21. The computer-implemented system of claim 11, wherein constructing the application-executable library comprising the query model further comprises compiling the query model into the application-executable library.